Jawatha mosque

Jawatha Mosque, also incorrectly spelled Al-Jawan, is located in the historic Jawatha area, about 12 km northeast of Hofuf, Al-Ahsa, Saudi Arabia. It was the earliest known mosque built in eastern Arabia. Most of the original structure fell into ruins. However, it was restored in 2007 by the Saudi Commission for Tourism and National Heritage, using a design similar to that of Masmak Fort in Riyadh.

Source: Wikipedia